[R-sig-eco] Fwd: adehabitatHR and kernelUD problems estimating home range size

[Calenge Clement]

Dear Isabella,

I do not have the data, but it seems that there is a problem with your 
object coords:

>> str(coords)
> Formal class 'SpatialPointsDataFrame' [package "sp"] with 5 slots
>    ..@ data       :'data.frame':    4423 obs. of  2 variables:
>    .. ..$ Individual: Factor w/ 14 levels "1","2","3","4",..: 1 1 1 1 1 1 1
> 1 1 1 ...
>    .. ..$ Season    : Factor w/ 2 levels "DRY","WET": 1 1 1 1 1 1 1 1 1 1 ...
>    ..@ coords.nrs : int [1:2] 4 3
>    ..@ coords     : num [1:4423, 1:2] 47.8 47.8 47.8 47.8 47.8 ...
>    .. ..- attr(*, "dimnames")=List of 2
>    .. .. ..$ : NULL
>    .. .. ..$ : chr [1:2] "Easting" "Southing"
>    ..@ bbox       : num [1:2, 1:2] 47.8 -14.4 47.8 -14.4
>    .. ..- attr(*, "dimnames")=List of 2
>    .. .. ..$ : chr [1:2] "Easting" "Southing"
>    .. .. ..$ : chr [1:2] "min" "max"
>    ..@ proj4string:Formal class 'CRS' [package "sp"] with 1 slot
>    .. .. ..@ projargs: chr "+init=EPSG:32638 +proj=utm +zone=38 +datum=WGS84
> +units=m +no_defs +ellps=WGS84 +towgs84=0,0,0"

Note that the slot @bbox indicates that all the points are located at 
the same place: xmin=xmax=47.8; ymin=ymax=-14.4. Similarly, the slot 
@coords indicate the same coordinates for all points (47.8, 47.8, etc.). 
Are you sure that you set your CRS correctly? My guess is that you have 
your coordinates in Latitude/Longitude, and that you defined the 
proj4string slot without projecting your data, i.e. you used :

proj4string(coords) <- CRS("+init=EPSG:32638")

instead of

proj4string(coords) <- CRS("+init=EPSG:4326")
coords <- spTransform(coords, CRS("+init=EPSG:32638"))

However, this is just a guess.
HTH,

Clément Calenge


-- 
Clément CALENGE
Ingénieur Expert -- Biométricien
Cellule d'appui méthodologique
Direction de la Recherche et de l'Expertise
Office national de la chasse et de la faune sauvage
Saint Benoist - 78610 Auffargis
tel. (33) 01.30.46.54.14